Ring gauge



J. BATH.

` GAUGE. APFLICATl LED MAR. 3l. 1920.

' 1,438,681. Patented Dec.12,1922.

da/rz Bath Patented lier.

JOHN BATH, 0F VORCESTER, MASSACHUSETTS, ASSIGNOR TO KUHN BATH @L CO., INC., OIE' W'ORCESTEB, MASSACHUSETTS, yA. COBDRATION 0F IIIASSACE'ISETTSL RING GAUGE.

Application led March 31, 1920. Serial No. 370,093.

testing external cylindrical sizes. Such ring @aug-es are commonly formed as a single oloelr of hardened metalu internal diameter.

It is the object of my invention to iinprore the construction of such gauges hy .u'oifiding plurality of axial openings ground to accurate about the. periphery thereof and between the inner and outer walls. Preferably these openings are uniformly spaced from each other and are' also yspaced at substantially siniilai' distances troni the inner and outer walls of the gauge.

i preferred form of my invention ,shown iu the drawings, in which-4 Fig. l is a plan view oli niy improve-d gauge; and

Fig'. 2 is an elevation thereof partly in section.

lle'terrina` to the drawings, I have shown a rinf; grange, having: a` cylindrical innen wall ll). a cylindrical outer wall l1., and a iilurality oli axial openings 12 exteiulingz4 through the gauge. rlhese openings are spaced around the' gauge and are preferaiily at suhstantially uniform distances 'from each other. It ,is also desirable that the oilfienir lially 'ne saine distances from the inner wa il .ill and the outer wall Ill, so that the stock remaining: on a" sides` of the oiieningjs l2 may e y.iiitiall'v tho same thickness. The outer ends oit each opening l2 are preferably rouniled over.. as shown in Figi.

to obtain advantages to he descrihed.

ll find that a grande constructed as desiihed ina-V he hardened with much loss I. (istortion than the usual solid oai/llege and that when once Lground to enact size. it is less suliject 'to temperature Variations, particularly to those caused hy holding the gauge in the hands. The heat ofthe hand does not pass readily through the wehhedv construction between the inner and outer n f' walls. The rounding' oi? the ends or the should vhe separa ted hy suhstanf holes l2 avoids sharp edges which may cause ldiilieultj/,f in hardening` and also strengthens the wehhed construction and improves the appearance of the gauge;

The new gauge is materially lighter than the usual solid gauge of the saine size. The inner portion or the `gauge niay he hardened while the outer portion remains unchanged,

if such construction is found desirable. Furthermore, it is found possible to draw and harden the inner portion ol' a worn gauge of this new type'in such a way as to shrink the gauge and permit it to he re ground7 thus addingn greatly to the useful life of the gauge.

Having; thus described my' invention, it

`will he evident that changes and modifications can be made therein hy those skilled in the art within the spiritfand scope thereoif as set `forth in the claims, and I do not wish to he otherwise limited to the details herein disclosed, but

l/Vhat I claim is y y l. :A ring gauge formed of a single hody of nietal hai/ing a cylindrical gauging opening centrally disposed therein and having side wall of substantial thickness with a plurality of axially extending circumferentially spaced openings therein, said latter openings being; entirely separated from said gauging opening by the intervening solid wall portion. i

2. A ring; gauge formed oil' single body of4 metal wi h cylindrical inner and `outer walls and having; a plurality oit openings extendingr axially through the .metal hetweeu said walls, said openings beingspaced apart and entirely separated from said inner and outer walls hy the .intervening solid wall portion, and haring rounded outer edges at hoth ends of: said openings.

3. A ring gauge connn'ising' a single. hlm

of metal haring an outer wall anda cyliir .roi-IN earn. 

